Use Mirlyn, the online catalog of the U-M Libraries, to search for books. You'll find a link to Mirlyn in the upper-right corner of any library webpage.
If you know the name of the book you need, simply perform a title search in Mirlyn. Use quotes around phrases for the best results.
If you're not sure of the exact title, try an 'All Fields' search using the words you know. Be sure to separate your search terms with AND in all capitals.
To find books on a particular topic, try an 'All Fields' search or, if that retrieves too many results, try a 'Subject' search to focus your results.